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The copyin clause provides a mechanism to assign the same value to threadprivate variables for each thread in the team executing the parallel region. For each variable specified in a copyin clause, the value of the variable in the master thread of the team is copied, as if by assignment, to the thread-private copies at the beginning of the parallel region. The syntax of the copyin clause is as follows:
copyin(variable-list)
The restrictions to the copyin clause are as follows:
A variable that is specified in the copyin clause must have an accessible, unambiguous copy assignment operator.
A variable that is specified in the copyin clause must be a threadprivate variable.